You'll be matching no matter what, it's a base silver, "candy" blue, clear coat. Like all those early colors, individual TX650's varied "quite a bit". Your example bike seems to show marked difference in the side cover color. The original clear coat also yellowed over time adding a slight green cast to the blue.
When I had a green one painted the painter called me said get down here and tell me when it's the green "depth" you want.